Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
smg

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/^(\d+\)\s*\d+\.\s+)(.*?) ISSN/sm'; $str = '6) 6. ACROSS LANGUAGES AND CULTURES Semiannual ISSN: 1585-1923 AKADEMIAI KIADO ZRT, BUDAFOKI UT 187-189-A-3, BUDAPEST, HUNGARY, H-1117 Social Sciences Citation Index Arts & Humanities Citation Index 7) 7. ACTA ANALYTICA-INTERNATIONAL PERIODICAL FOR PHILOSOPHY IN THE ANALYTICAL TR ADITION Quarterly ISSN: 0353-5150 SPRINGER, 233 SPRING ST, NEW YORK, USA, NY, 10013 Arts & Humanities Citation Index 8) 8. ACTA ARCHAEOLOGICA Annual ISSN: 0065-101X WILEY, 111 RIVER ST, HOBOKEN, USA, NJ, 07030-5774 Arts & Humanities Citation Index 9) 9. ACTA BOREALIA Semiannual ISSN: 0800-3831 ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON, ENGLAND, OXON, OX14 4RN Arts & Humanities Citation Index 10) 10. ACTA CLASSICA Annual ISSN: 0065-1141 UNIV FREE STATE, DEPT ENG CLASSICAL LANG, PO BOX 339, BLOEMFONTEIN, SOUTH AFRICA, 9300 Arts & Humanities Citation Index 11) 11. ACTA HISTORICA TALLINNENSIA Annual ISSN: 1406-2925 ESTONIAN ACADEMY PUBLISHERS, 6 KOHTU, TALLINN, ESTONIA, 10130 Arts & Humanities Citation Index 12) 12. ACTA HISTRIAE Tri-annual ISSN: 1318-0185 4 تاریخ انتشار: 89/2/62 پژوهشگاه و شبکه آزمایشگاهی 98/3 :Code UNIV PRIMORSKA, SCI RES CENTRE KOPER, GARIBALDIJEVA 1, KOPER, SLOVENIA, CAPODISTRIA, SI-6000 Social Sciences Citation Index Arts & Humanities Citation Index 13) 13. ACTA KOREANA Semiannual ISSN: 1520-7412 ACADEMIA KOREANA KEIMYUNG UNIV, 1095 DALGUBEOLDAERO, DALSEO-GU, DAEGU, SOUTH KOREA, 704-701 Arts & Humanities Citation Index Current Contents - Arts & Humanities 14) 14. ACTA LINGUISTICA HUNGARICA Quarterly ISSN: 1216-8076 AKADEMIAI KIADO ZRT, BUDAFOKI UT 187-189-A-3, BUDAPEST, HUNGARY, H-1117 Social Sciences Citation Index Arts & Humanities Citation Index 15)15. ACTA LITERARIA Semiannual ISSN: 0717-6848 UNIV CONCEPCION, FAC HUMANIDADES ARTE, CASILLA 160-C, CORREO 3, CONCEPCION, CHILE, 00000 Arts & Humanities Citation Index 16) 16. ACTA MUSICOLOGICA Semiannual ISSN: 0001-6241 INT MUSICOLOGICAL SOC, BOX 561, BASEL, SWITZERLAND, CH-4001 Arts & Humanities Citation Index Current Contents - Arts & Humanities 17) 17. ACTA ORIENTALIA ACADEMIAE SCIENTIARUM HUNGARICAE Quarterly ISSN: 1588-2667 AKADEMIAI KIADO ZRT, BUDAFOKI UT 187-189-A-3, BUDAPEST, HUNGARY, H-1117 Arts & Humanities Citation Index 5 تاریخ انتشار: 89/2/62 پژوهشگاه و شبکه آزمایشگاهی 98/3 :Code Current Contents - Arts & Humanities 18) 18. ACTA PHILOSOPHICA Semiannual ISSN: 1121-2179 FABRIZIO SERRA EDITORE, PO BOX NO,1, SUCC NO. 8, PISA, ITALY, I-56123 Arts & Humanities Citation Index Current Contents - Arts & Humanities'; $subst = ""; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$result;

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php